Superhydrophobic aerogel that does not require per-fluoro compounds or contain any fluorine

a technology of aerogels and hydrophobic coatings, applied in the direction of anti-corrosion paints, synthetic resin layered products, woven fabrics, etc., can solve the problem of not being cost-effective to manufactur

Inactive Publication Date: 2012-02-16
NAT TECH & ENG SOLUTIONS OF SANDIA LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]According to various embodiments, there is a method for preparing a superhydrophobic coating. The method can include providing an ultra high water content acid catalyzed polysilicate gel formed using a first solvent, at least one alkoxy silane precursor, water, and an acid, wherein the polysilicate gel can include a three dimensional network of silica particles having surface functional groups and a plurality of pores, and wherein a fluid is disposed in the plurality of pores, the fluid including the first solvent, one or more reaction products of the acid catalyzed hydroly

Problems solved by technology

Because of the staggering costs stemming from corrosion of steel, there is a tremendous need to develop multifunctional coatings that can outperform traditi

Method used

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  • Superhydrophobic aerogel that does not require per-fluoro compounds or contain any fluorine
  • Superhydrophobic aerogel that does not require per-fluoro compounds or contain any fluorine
  • Superhydrophobic aerogel that does not require per-fluoro compounds or contain any fluorine

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example 1

Formation of a Superhydrophobic Coating

[0030]

TABLE 1for 100 mLMaterial Namevol. fractiongel volumeMethanol0.0832 vol / vol8.32 mlTetramethylorthosilicate (TMOS)0.0989 vol / vol9.89 mlDionized Water0.8155 vol / vol81.55 ml 1.0N Hydrochloric Acid (HCl)0.0024 vol / vol0.24 ml

[0031]Combined the reagents given in Table 1 in the order they are listed. Agitated the reaction mixture and placed at about 50° C. for a period of approximately 120 hours. Upon the completion of the reaction, the gel had an opaque appearance and was rather firm. Tapping the bottom of the reaction vessel resulted in a reverberation throughout the gel. Broke up the gel with a clean utensil (e.g. stir rod, spatula, etc.) and added approximately 100 ml of hexane to the broken gel in the reaction vessel. Allowed solvent exchange for at least 30 minutes at about 50° C. After the solvent exchange period, removed excess hexane with a glass pipet and / or syringe and repeated the hexane wash at least once more. After draining excess...

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Abstract

Provided are superhydrophobic coatings, devices and articles including superhydrophobic coatings, and methods for preparing the superhydrophobic coatings. The exemplary superhydrophobic device can include a substrate component and one or more superhydrophobic coatings disposed over the substrate component, wherein at least one of the one or more superhydrophobic coatings has a water contact angle of at least about 150° and a contact angle hysteresis of less than about 1°. The one or more superhydrophobic coatings can include an ultra high water content acid catalyzed polysilicate gel, the polysilicate gel including a three dimensional network of silica particles having surface functional groups derivatized with a silylating agent and a plurality of pores.

Description

RELATED APPLICATIONS[0001]This application claims priority from U.S. Provisional Patent Application Ser. No. 61 / 077,145, filed Jun. 30, 2008, which is hereby incorporated by reference in its entirety.GOVERNMENT RIGHTS[0002]The present invention was developed under Contract Nos. DE-AC04-94AL85000 between Sandia Corporation and the U.S. Department of Energy and FA9550-06-C-0033 awarded by the U.S. Air Force Office of Scientific Research. The U.S. Government has certain rights in this invention.FIELD OF THE INVENTION[0003]The subject matter of this invention relates to protective coatings and, more particularly, to superhydrophobic coatings.BACKGROUND OF THE INVENTION[0004]In recent years, defense related corrosion costs have been estimated to be more than about 7% of the total annual U.S. defense cost with about 20% of the estimated corrosion related costs involving scraping and repainting steel structures. Because of the staggering costs stemming from corrosion of steel, there is a t...

Claims

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Application Information

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IPC IPC(8): C09D183/02C09K3/18B05D1/18B05D1/28B05D5/00B32B5/02B05D1/30B05D7/14B05D7/00B32B5/18B32B9/04C09D5/08B05D1/02C09D7/62
CPCC08K3/36C08K7/26C08K9/06C09D183/02C09D5/1687C09D7/1225C09D5/14C09D7/62Y10T442/218Y10T428/249986Y10T428/24975Y10T428/249953Y10T428/249981Y10T428/24999Y10T428/249991Y10T442/20Y10T442/2279Y10T442/2525Y10T442/259C09K3/18
Inventor KISSEL, DAVID J.BRINKER, CHARLES JEFFREY
Owner NAT TECH & ENG SOLUTIONS OF SANDIA LLC
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